Thousand Islands Marine National Park wilderness guide
Marine National Park · NY

Thousand Islands Marine National Park

Thousand Islands Marine National Park is a stunning aquatic preserve renowned for its archipelago of over 1,800 islands along the Saint Lawrence River between the United States and Canada. Ideal for water-based recreation, the area offers unparalleled opportunities for boating, fishing, and exploring historic sites.

Marine National Park55,0004+ Trails

Designation

Marine National Park

Total Wilderness Area

55,000

Elevation / Terrain

Diverse Wilderness

Field Editorial Guide

About Thousand Islands Marine National Park

Thousand Islands Marine National Park is a stunning aquatic preserve renowned for its archipelago of over 1,800 islands along the Saint Lawrence River between the United States and Canada. Ideal for water-based recreation, the area offers unparalleled opportunities for boating, fishing, and exploring historic sites.

Wilderness Landscape & Natural Heritage

Thousand Islands Marine National Park boasts a picturesque collection of islands scattered across the Saint Lawrence River, marking the border between the U.S. and Canada. This park's geographic features include rocky shores, lush forests, and freshwater ecosystems that provide habitat for diverse wildlife. Historically, the area has been significant for both Native American tribes and European settlers. Visitors flock to the park for its excellent water-based recreation opportunities, such as kayaking, fishing, and boating. Notable landmarks include Boldt Castle on Heart Island and the renowned Zavicon Island believed to feature the shortest international bridge. The park's charm lies in its ability to offer both adventure and tranquility, making it a beloved destination for nature enthusiasts and history buffs alike.

Field Guide · Marine National Park
Adventure Destinations

Notable Destinations Near Thousand Islands Marine National Park

Scenic viewpoints, outdoor landmarks, and notable points of interest within 60 miles.

Key Wilderness Highlights

✦ Boldt Castle on Heart Island✦ Thousand Islands Bridge connecting the U.S. and Canada✦ Zavicon Island and its iconic bridge✦ Diverse bird-watching opportunities
Wilderness Recreation

Outdoor Adventures in Thousand Islands Marine National Park

Explore curated guides for top outdoor sports, trail networks, and wilderness activities.

Park Recreation

Boating

Available in Thousand Islands Marine National Park
Park Recreation

Fishing

Available in Thousand Islands Marine National Park
Park Recreation

Kayaking

Available in Thousand Islands Marine National Park
Park Recreation

Wildlife Viewing

Available in Thousand Islands Marine National Park
Park Recreation

Historical Tours

Available in Thousand Islands Marine National Park
Park Recreation

Photography

Available in Thousand Islands Marine National Park
The Ranger Station

Visitor Logistics & Essential Planning

Everything you need to know about entrance passes, seasons, visitor centers, road transit, and wildlife safety in Thousand Islands Marine National Park.

Passes & Fees

Entrance Requirements & Interagency Passes

Standard entry fees apply; additional permits for fishing and special tours may be required.

Wilderness Checklist

Carry paper topographic map & compass in remote zones.
Store all food and scented items in approved bear canisters.
Check wildfire / smoke advisories before backcountry departure.
Pack out everything you pack in (Leave No Trace).
Wilderness Stays

Camping & Overnight Stays in Thousand Islands Marine National Park

Frontcountry developed campgrounds, backcountry wilderness permit guidelines, and starry-night camping advice.

Wellesley Island State Park

Located on Wellesley Island, this campground offers easy access to trails and recreational facilities.

Keewaydin State Park

Situated near the riverbanks, ideal for anglers and families seeking a tranquil outdoor experience.

Adventure Basecamps

Gateway Towns Near Thousand Islands Marine National Park

Stay, dine, and gear up in these mountain towns and scenic basecamps surrounding the park.

Alexandria Bay, New York
⌖ 0.91 miles
Gateway Basecamp

Alexandria Bay, New York

Alexandria Bay is a lively gateway to the Thousand Islands with outstanding boating, paddling, fishing, and hiking. Explore historic castles, scenic river views, and seasonal outdoor adventures in a welcoming small-town setting.

Late spring through early fall
Explore Town
Wellesley Island, New York
⌖ 1.84 miles
Gateway Basecamp

Wellesley Island, New York

Wellesley Island in New York’s St. Lawrence River is a top spot for hiking, paddling, fishing, and camping. With accessible trails, calm waters, and lakeside campgrounds, it’s a refreshing outdoor destination from late spring through fall.

Late Spring through Early Fall
Explore Town
Chippewa Bay, New York
⌖ 10.30 miles
Gateway Basecamp

Chippewa Bay, New York

Chippewa Bay, New York, offers a tranquil Adirondack escape perfect for kayaking, fishing, boating, and wildlife viewing along the St. Lawrence River. With calm waters and scenic islands, it’s a prime spot for nature lovers seeking a low-key outdoor adventure.

Late Spring through Early Fall
Explore Town
Clayton, New York
⌖ 11.17 miles
Gateway Basecamp

Clayton, New York

Clayton, NY, is an outdoor playground where paddling the Thousand Islands, hiking scenic trails, and fishing on the St. Lawrence River come together. This friendly river town offers year-round adventure with charming local culture.

Late Spring to Early Fall
Explore Town
Upper Town Landing, New York
⌖ 11.21 miles
Gateway Basecamp

Upper Town Landing, New York

Upper Town Landing, New York, offers a quiet riverside retreat ideal for kayaking, canoeing, and fishing along the Hudson River. Nearby trails and birdwatching spots add to its appeal as a peaceful outdoor destination.

Late Spring to Early Fall
Explore Town
Gananoque, Ontario
⌖ 12.10 miles
Gateway Basecamp

Gananoque, Ontario

Gananoque is a friendly town on the St. Lawrence River, perfect for paddlers, hikers, and anglers exploring the spectacular 1,000 Islands. Enjoy boating, cycling, and winter sports with easy access to parks and water adventures.

Late Spring to Early Fall
Explore Town
Expert-Led Wilderness Expeditions

Guided Experiences in Thousand Islands Marine National Park

Explore scenic backcountry routes and epic wilderness adventures with certified local mountain guides, naturalists, and outfitters.

Ride the River: Hacker Craft Cruise and La Duchesse Houseboat Tour in Clayton
ADVEXPEDITION
Clayton, New York
Boat TourADV Bookable

Ride the River: Hacker Craft Cruise and La Duchesse Houseboat Tour in Clayton

The All Inclusive Admission Package pairs a 45‑minute ride aboard a 30′ triple‑cockpit Hacker Craft with a 30‑minute guided walking tour of La Duchesse and full museum admission—this guide clarifies timing, booking limits, and accessibility.

Boat TourPT2HCertified Outfitter
Bookable OnlineBook Trip